最近,paizaのdを全盗.
rubyでのarrayの要素数はlength,size以外だとcountもあった.
countメソッドは、配列の中で引数objと同じ要素の数を返します。引数を省略したときは、単純に要素の数を返します。
numbers = [1, 2, 5, 5, 1, 3, 1, 2, 4, 3] puts numbers.count(1) puts numbers.count3 10
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Rubyでの配列の数、要素の長さの出し方の3つめ？
Last updated at Posted at 2018-04-11
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